Open The Http Port - D-Link DCS-2121 User Manual

3) Open the HTTP Port

The HTTP Port option is used when multiple cameras are being installed behind a single public
IP address and will be accessed remotely OR for using a port other than the default port for
image viewing. For each additional camera that is installed, you must assign the appropriate
Web server port for each camera to enable remote viewing.
By default, port 80 (Web server port) is open. If these ports are available for use, you DO NOT
have to open a second port and can proceed to the next section.
If port 80 is not available (for example, if you are already using port 80 to run a Web server or
your ISP blocks access on port 80*) you MUST open a second port and designate a new Web
server port (800, 801, 802, etc.). Similarly, if port 554 is not available, you will need to open a
different port for RTSP.
Note: Be sure to take note of these settings since these same settings will be used to configure
your router.
Note: Some ISPs block traffic on commonly used ports like port 80 to disallow consumers from
putting a server on their network. Be sure to check with your ISP so that you can open the
appropriate ports accordingly. If your ISP does not pass traffic on port 80, you will need to
change the Web server port the camera uses from 80 to something else, like 800. If you are
behind a residential gateway, you will need to open a corresponding port on your gateway as
well. Not all gateways are the same, please refer to your gateway's user's manual for specific
instructions on how to forward ports.
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